Hi,posting here for traffic rather than in The Litter Tray section. Has anyone used one of these on their cat? And are they any good?! I've tried numerous flea treatments on my cat but they keep coming back! She seems fine for about 2 -3 weeks after treatment,then the scratching starts again. She's actually pulled some fur out on her rump,just in front of the base of her tail as she keeps chewing at it. I wondered whether an electronic flea comb would zap them once and for all?